const char *

[Chunekit Pong]

how can I concatenate an integer into a string?

the following does not work

Create function takes a (const char *)

==============
for ( int i = 0; i < 8; i++) {
m_Piano[i].Create("image" + i + ".png");
}

[Nathan Mates]

Post by Chunekit Pong
how can I concatenate an integer into a string?

If you're using char* for strings -- which is far more C-style
strings than the C++ code you showed -- then you should become good
friends with the printf family of functions, especially sprintf. Go
consult your language documentation or textbook for more details.
Hint: %d is your friend here.

Nathan Mates
--
<*> Nathan Mates - personal webpage http://www.visi.com/~nathan/
# Programmer at Pandemic Studios -- http://www.pandemicstudios.com/
# NOT speaking for Pandemic Studios. "Care not what the neighbors
# think. What are the facts, and to how many decimal places?" -R.A. Heinlein

[xiaosi]

#include <stdio.h> //_snprintf
char sz[16];
for ( int i = 0; i < 8; i++) {
_snprintf(sz, sizeof(sz), "image%d.png", i);
m_Piano[i].Create(sz);
}

-or-
char sz[] = "imageX.png";
for ( int i = 0; i < 8; i++) { //i must < 10
sz[sizeof("image")-1] = i + '0';
m_Piano[i].Create(sz);
}

Post by Chunekit Pong
how can I concatenate an integer into a string?
the following does not work
Create function takes a (const char *)
==============
for ( int i = 0; i < 8; i++) {
m_Piano[i].Create("image" + i + ".png");
}

[Ulrich Eckhardt]

Post by Chunekit Pong
how can I concatenate an integer into a string?

Two steps:
1. Convert the integer to a string.
2. Concatenate the strings.

Using those as basics, you should be able to easily find information with a
websearch. BTW: I agree that it would be more C++ish to use 'std::string'
instead of 'char const*', even if you can't change the parameter there is
still the 'c_str()' memberfunction. For formatting, 'std::stringstream' is
a good start then.

Uli